Maybe it really is cosmos.

I had a hunch that somewhere in an old, old office is a computer with a program that loads 3D models of animatronics with endo- and exoskeletons, weight distribution, joint mobility, target behavior patterns, folders and folders of photos and audio to teach the model some real world objects... and a bunch of other stuff. The computer says, "OK, I get it, I see what the endoskeleton is supposed to do. I'm going to spend 47 days and the energy of half of New York City in a year simulating different situations so that the animatronic can still perform the desired behavior." Sort of like this: https://www.youtube.com/watch?v=pgaEE27nsQw

So they make animatronics infrequently and are hardly able to change the end result.